Punch-grinding machine



H. W. HODGSON.

PUNCH GRINDING MACHINE. APPLICATION FILED gums, 1920.

1,377,481 Patented May 10, 1921.

* UNITED STATES PATENTQFFICB H HAROLD WM. Robeson, or woncnsrnn, ivrAssAcnusErrsfq;

a To all whom item/a3 concern."

Be it knownthat I, HAROLD W. HODGSON, a subject of the King of Great Britain,.residing at Worcestenin the county of Worcester and State of Massachusetts, have invented a new and useful Punch-Grinding Machine, of which the following is a specification.

This invention relates to a machine for grinding punches and reamers for use in forming and shaping the dies through which wire is drawn. 1 j

The principal objects of the inventionare to provide a machine, operating with a cylindrical stone and usingthe edge thereof, to

I grind any desired taper, any curve, and any shape of point for dry drawing or wet drawing asmay be desired; to provide means for getting thedesired shape by moving both the grinding stone and the chuck for holding the steel to be ground; and to improve and simplify previous machines for this general purpose. Further objects andadvantages of the invention will appear hereinafter.

Reference is tobe had to the accompanyin drawings,in which' ing machine constructed in accordance with this invention, and

Fig. 2 is a plan of the same.

The machine is shown as comprising a base or stand 10, provided with a longi tudinal pair of ways or guide 11. Longitudinally on this guide moves a slide 12 on. which is a head 10. The head carries bearings 13 for the grinding shaft 1& which is driven through a pulley 15 by a belt from overhead or in any other way. This shaft is provided with a grinding wheel 16 of cylindrical form such as is ordinarily used for the purpose of this machine. The grinding takes place on the edge of this wheel or stone instead of its side. Any kind of ordinary stone can be used, including small grinding stones and emery wheels. V

The motion of this head is obtained by means of a vertical shaft 20 driven from a worm wheel 21, operated by a worm 19. These parts are mounted on the frame 10 or a bracket supported by it. The shaft 20 is provided with a so-called double heart cam 22, that is a cam having a heart-shaped groove in it formovmg a pm 23. Thls pin is connected by an arm 24 with the slide 12 and causes its head to reciprocate with a pregure l is'a slde vlew of a punch grind Specification of Letters Patent. P atentefl Mayjo, 1921, Application filed August 5, 1920; Serial n. 401,343.

' 28 that may be given any desired shape to control the parts connected therewith. This is mounted on an adjusting member 29 movable transversely on a'slide' 30. This member 29 is adjustably.connectedwith theslide by a screw 31 having a handwheel 32 for adjusting it. The .slide 30 is mounted to move transversely and freely on ways 33. It can be movedback by the former 27 coming in contact with the roller 26. A chainior cable 34: is shown having a weight35 on it passing over a pulley 36 for always forcing the slide back .so that the. former is always in contact with. the roller. I 1

On this slide 30 is mounted a vpivotally adj ustable head 41 having bearings for a shaft 37. This shaft has a pulley. 38 which is driven by a belt or otherwise and has a .chuck 39 for carrying the steel 40 constituting a blank that is to be ground on the edge of the wheel. 16.. I

The location ofthe former withrespect to the roller26 is such that thesteel 40 may be located at the edge of the grindin wheel as indicated especially in the plan, *ig. 2.

As theslide'12 reciprocates longitudinally in a predetermined manner positively controlled by the cam 22, the former also will reciprocate transversely. This brings the steel toward and fromthe edge of the wheel in such manner as is determined by the shape of the former 27. Therefore, the steel or punch 40 can be ground to any desired kind of point or any curve or taper that maybe desired, and all punches produced from a single setting of the parts will be alike.

The principle of this invention is also capable of being usedfor grinding other articles than the one specifically mentioned,

and I do not wish to be limited to the grind- 3 1. In a punch or reamer grinding machine,

the combination of a slide, a head, a shaft mounted in bearlngs thereon, a grinding wheel carried by said shaft, means for moving of this particular article or to the de mg said slide longitudinally, a transversely movable slide, a head swiveled on the second slide, a chuck on the last named head'for 2. In a grinding machine of the character i described, the combination of a movable slide, a head thereon, a cam, means; connectedwith the cam for reciprocating'the slide, a grinding wheel carried by the head, rotatable on an axisparallel with the direction of reciprocation of the slide, achuck for carrying the work to be ground located in position to hold the work on the edge of the grinding wheel, a former movable transversely with said chuck, and a roller mounted on said slide and engaging said former for causing a relative transverse motion between said chuck and wheel. I

3. In a grinding machine, the combination with a base or frame havingwayslongitudinally located thereon, of a head mounted v to slide on said ways, a rotatable cylindrical for operating the head, a rotatable grinding wheel carried by the head, a chuck for carrymg the'work to be ground located in position to hold the work at the edge of the grinding 'wheel, a roller movable with the head, a

able slide for supporting said chuck, a

former adjustably mounted on said slide to move therewith and having aforming surfact, and means connected with said head controlling themotion of said former and slide.

6.111 a grinding machine, the combination with a head, shaft mounted in bearings thereon, a grinding wheel carried by said shaft, means for moving said headlOngitudi nally, a chuck for holding theblank totbe ground, means for moving the blank transversely, a former havinga surface for controlling the motion or said chuck, said former being connected therewith, and means ,movable with the head for engaging said former and thus, controlling the transverse v motion of said former and chuck. V,

In testimonywhereof I have hereunto affixed my slgnature.

HAROLD WMQHODGSONI; 

